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Jillian Holtzmann took the initiative and built several Proton Sidearms. She introduced the Proton Blaster along with the the other Proton Sidearms after the Ghostbusters met Mayor Bradley. The Blaster was taken into the field by Patty Tolan for the battle with Rowan North and the Times Square Battle Ghosts. She kept it in her right leg holster. Of all the sidearms, it was the only one not fired or used in combat during the incident.

↑Holder, Nancy (July 2016). Ghostbusters, p. 237. Tom Doherty Associates, LLC, New York NY USA, ISBN 076538843X. Narrator says: "Patty used her 'ghost chipper,' a device that sucked in a ghost, chopped it up into ectoplasmic bits, and shot the debris out the back like a burst of exhaust. She also had a proton sidearm that Holtzmann hadmadefor her."

↑fxguide "Who you gonna call? Call Illoura, MPC, SPI, & Zero VFX" 8/10/16Line reads: "As an aside, the Proton pistol weapon shows up briefly in the weapon training montage slightly adapted from the original concept art. However, as real world toy companies get production artwork early, the actual toy gun one can buy from Amazon is modelled on this concept design (below right)."